Fix nil consolidated comment

[mknapik]

If all comments already existed,
consolidation feature transformed empty list into nil.

Fixes #188

[doomspork]

Looks good @mknapik, should we add a test for this?

[mknapik]

Probably we should but I found it difficult to setup a spec for formatter.
I think we should consider extracting deduplication and consolidation logic to separate classes.

[mknapik]

See my proposal for refactoring: https://github.com/mknapik/pronto/commit/199346a6334c0954f8d6bb3fa3885d63cfa8fd93
No specs yet.

[doomspork]

@mknapik I like your refactor and the only feedback I have would be perhaps we can use something other than #call as the primary method, at first glance I thought you were using Method.call.

[mmozuras]

@mknapik overall, I like the idea for the refactoring. I'd have a couple of nits to pick, but will save them for the PR 😄

[mknapik]

At the moment I don't have time to finish the refactoring.
How about fixing the bug first and in the next PR I'll try to refactor.

[mmozuras]

@mknapik 👌

[mknapik]

@mmozuras Thanks!
When are you planning the next release?

[mmozuras]

@mknapik this year 🙃. Hopefully, mid-November, but don't want to promise anything.